U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8726761 PUBLICATION DATE: 02/26/2004
Name: DUNEDIN CITY DOCK
FL
NOAA Chart: 11412 Latitude: 28° 0.8' N ( 28.01330)
USGS Quad: DUNEDIN Longitude: 82° 47.6' W ( -82.79330)
To reach the tidal bench marks from the intersection of State Route 580 (Marina
Place) and Edgewater Drive in Dunedin, proceed west on Marina Place to its end
at the city dock. The bench marks are located along Marina Place and Victoria
Drive. The tide gage and staff were located at the west end of the city dock at
the foot of Marina Place.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6 1973
DESIGNATION: 872 6761 TIDAL 6
MONUMENTATION: Tidal Station disk VM#: 7568
AGENCY: National Ocean Survey (NOS) IDB PID#: AL0401
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 28° 0.7' N ( 28.01170) LONGITUDE: 82° 47.6' W ( -82.79330)
The primary bench mark is a disk set flush in the top of a 1 m (2 ft) thick
concrete sea wall on the south side of Marina Place across from the Jamaica Inn,
on the north side of the Dunedin Yacht Basin, 32 m (105 ft) east of the basin
entrance, 3 m (10 ft) south of the north corner of a jog in the sea wall, and
0.24 m (0.8 ft) above the pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8726761 PUBLICATION DATE: 02/26/2004
Name: DUNEDIN CITY DOCK
FL
NOAA Chart: 11412 Latitude: 28° 0.8' N ( 28.01330)
USGS Quad: DUNEDIN Longitude: 82° 47.6' W ( -82.79330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4
DESIGNATION: 872 6761 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 7569
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AL6288
SETTING CLASSIFICATION: Concrete curb OPUS PID#: AL6288
LATITUDE: 28° 0.8' N ( 28.01330) LONGITUDE: 82° 47.4' W ( -82.79000)
The bench mark is a disk set in the top of the east curb of Victoria Drive, 82 m
(268 ft) north of the centerline of Main Street, 49 m (162 ft) south of the
centerline of Monroe Street, 5.03 m (16.5 ft) north of the centerline of a
sidewalk leading to the house at 821 Victoria Drive, and 3 m (9 ft) east of the
centerline of Victoria Drive. NOTE: Mark not found by US Power Squadron in 1995.
BENCH MARK STAMPING: NO III
DESIGNATION: 872 6761 TIDAL 3
MONUMENTATION: Bench Mark disk VM#: 7570
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AL6289
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID#: AL6289
LATITUDE: 28° 0.8' N ( 28.01330) LONGITUDE: 82° 47.5' W ( -82.79170)
The bench mark is a disk set in the center of the sidewalk, set in the top of
the old sea wall at the west end of Main Street, by the east end of the fishing
pier leading to Dunedin Fish Company Store, 29 m (95 ft) west of the centerline
of Victoria Drive on the south/SE portion of the Jamaica Inn Motel property, 9 m
(29 ft) north of the centerline of Main Street, and 1 m (3 ft) south of a
concrete block wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8726761 PUBLICATION DATE: 02/26/2004
Name: DUNEDIN CITY DOCK
FL
NOAA Chart: 11412 Latitude: 28° 0.8' N ( 28.01330)
USGS Quad: DUNEDIN Longitude: 82° 47.6' W ( -82.79330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: FLORIDA SRD B.M. NO 115
DESIGNATION: 115 FLHD
ALIAS: FLORIDA SRD
MONUMENTATION: Survey disk VM#: 7571
AGENCY: Florida State Road Department (FLSRD) IDB PID#: AL0007
SETTING CLASSIFICATION: Concrete abutment of culvert OPUS PID:
LATITUDE: 28° 0.7' N ( 28.01170) LONGITUDE: 82° 47.5' W ( -82.79170)
The bench mark is a disk set in the top center of a 0.15 m (0.5 ft) thick
concrete abutment of a culvert at the intersection of Monroe Street and Victoria
Drive, 9 m (30 ft) west of the centerline of Victoria Drive, 8 m (27 ft) south
of the north end of the abutment, 1 m (3 ft) north of the south end, and 1 m (4
ft) below road level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8726761 PUBLICATION DATE: 02/26/2004
Name: DUNEDIN CITY DOCK
FL
NOAA Chart: 11412 Latitude: 28° 0.8' N ( 28.01330)
USGS Quad: DUNEDIN Longitude: 82° 47.6' W ( -82.79330)
T I D A L D A T U M S
Tidal datums at DUNEDIN CITY DOCK based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: June 1975 - August 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726724 CLEARWATER BEACH, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.876
MEAN HIGH WATER MHW = 0.770
North American Vertical Datum NAVD88 = 0.533
MEAN SEA LEVEL MSL = 0.475
MEAN TIDE LEVEL MTL = 0.464
MEAN LOW WATER MLW = 0.157
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6 1973 1.798 1.028
NO 4 2.514 1.744
NO III 1.972 1.202
FLORIDA SRD B.M. NO 115 1.567 0.797
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8726761 PUBLICATION DATE: 02/26/2004
Name: DUNEDIN CITY DOCK
FL
NOAA Chart: 11412 Latitude: 28° 0.8' N ( 28.01330)
USGS Quad: DUNEDIN Longitude: 82° 47.6' W ( -82.79330)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.